Is there anyway to autohide top-bar Habpanel?

So I have been reading through various discussions that advise setting kiosk=on parameter to hide the top bar.

But frankly speaking I have never been able to make it working - it just does not change anything.
I am using:

  • latest unstable daily build of openHAB
  • Safari, Chrome on MacOS, Chrome on Android, Chrome on IOS
  • my url is something like: https://openhab_host/habpanel/index.html?kiosk=on

What am I doing wrong? What effect do you exactly observe by adding kiosk=on to your urls?

Thanks
Pawel